Study On The Preparation And Relative Performance Of Molybdenum-based Nanostructures

The nanomaterials,as a new technology,have been widely used in various fields,such as electronic devices,liquid crystal display,medicine and so on.Moreover,the molybdenum-based nanostructures,as a important branch of the nanomaterials,have obtained tremendous progress.We choose the molybdenum as research subjects,explore the preparation of the molybdenum oxide ultrathin nanobelts,the preparation of the complex of RGO/MoO₃ nanobelts and their photocatalysis in the article.The specific studies are as follows:1.The original MoO₃ nanobelts are first prepared using molybdenyl acetylacetonate as a single precursor by hydrothermal at 180?,48h.However,the sizes of the nanobelts are large,so the MoO₃ nanobelts arereprocessed with hydrogen peroxide?H2O2,30%?by hydrothermal at 170?,24h.Through the test of XRD,SEM,TEM and Raman,we find that the aspect ratios of the MoO₃ nanobelts are larger,the edges change smoother and the nanobelts become much thinner when the MoO₃ nanobelts reprocessed with H2O2.What's more,we have measured the specific surface area?BET?of the nanobelts,and find that the BET increased from 9.53m2/g to 11.74 m2/g which improved by 23.19%when the MoO₃ nanobelts are reprocessed with hydrogen peroxide.2.The adsorption and photocatalys of the nanomaterials are structure-sensitived,to understand the effects of the morphologies on them,we study the impacts for wastewater treatment of MoO₃ nanobelts when they are reprocessed with H2O2 by the degradation of MB as the model reaction.The results show that,when the MoO₃ nanobelts are reprocessed with H2O2,the adsorption rate of the MoO₃ nanobelts increase from 6.98%to 30.02%and increase by 3.3 times,moreover,the photocatalytic degradation rate of MoO₃ nanobelts improve from 52.03%to 79.55%by 29.52 percent.3.To further improve the photocatalytic properties of molybdenum oxide,we first synthesis the graphene oxidethe by the modified Hummers method,and then realize the complex of the grapheme and MoO₃ nanobelts by hydrothennal method.4.Finally,we study that the photocatalytic properties of the complex of the grapheme and Mo03 nanobelts with the various contents of the grapheme are 1wt%?2wt%?3wt%?4wt%and 5wt%,respectively.The results of the research shows that the photocatalytic properties of the complex are improve when the contents of the grapheme increase,and the photocatalytic properties are the highest when the grapheme is 4wt%.If we continue to increase the content of the grapheme,the photocatalytic properties decrease.The highest photocatalytic reaction rate is 0.0496 min-1,however,the photocatalytic reaction rate of the pure MoO₃ nanobelts is only 0.0138min-1,the reaction rate improve 2.6 times when the content of the grapheme is 4wt%.The reasons why the photocatalytic reaction rates improve when the MoO₃ nanobelts compound with grapheme as follow:On the one hand,the graphene has excellent carrier transport properties,which contribute to separate the light-generated electron-hole pairs and make the light-generated electron-hole react with the methylene blue timely,these make the complex have higher photocatalytic reaction rate;On the other hand,the methylene blue molecules between graphene sheets and were transferred through a combination of ?-?;,this make the the methylene blue molecules contact with the MoO₃ nanobelts,which somehow increase the photocatalytic reaction rate of MoO₃ nanobelts.However,the grapheme will hinder some photon irradiating on the MoO₃ nanobelts when the content of grapheme is too high,which reduce the photocatalytic reaction rate of the complex of the graphene and MoO₃ nanobelts.